These units have been designed to specifically meet the needs of any low to high duty storage you may need and can even be converted into a second level storage systems (Catwalk). These units can withstand weights from 320lbs per shelf level all the way to 700lbs per shelf level depending on the configuration. Most of our Light to heavy duty shelving units are completely boltless allowing for quick and easy assembly with Ultimate performance In mind. Our innovative shelving systems are designed to withstand any application no matter how small or big. The units can also be used to construct Single two and even three tier structures up to 26 Feet high.